# O vs TAN.24

The clearest difference is update cadence: O at monthly against TAN.24's every 34 months. O also leads on device support. TAN.24's advantage is iOS requirement (13.0 vs 16.0). On price and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

O ships an update monthly, TAN.24 every 34 months. The most recent releases landed on September 10, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | O | TAN.24 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | — |
| Update frequency | **Monthly** | Every 34 months |
| Monetization | Ad-supported | — |
| Size | 193 MB | 87 MB |
| Requires iOS | 16.0 | **13.0** |
| Devices | **iPhone, iPad** | — |
| Age rating | 4+ | 4+ |
| Developer | [o studio christchurch limited](https://appshunter.io/developer/1483845070) | [Treshna Enterprises](https://appshunter.io/developer/959435261) |

## What reviewers say

### O

[App page](https://appshunter.io/ios/app/o-studio/id1483845071)

Manage your wellness journey with this app. View class schedules, book appointments, and access special in-app promotions. Streamline your health and fitness routine.

**Highlights:** View class schedules, Sign up for classes, Book appointments, Access exclusive promotions, Manage wellness routine

**Features:** macOS Compatibility, Apple Wallet, Vision Pro support

**In-app purchases:** none


### TAN.24

[App page](https://appshunter.io/ios/app/tan24/id6450909060)

**In-app purchases:** none


## Frequently asked questions

### Is O free?

O is free to download, with no in-app purchases.

### Is TAN.24 free?

TAN.24 is free to download, with no in-app purchases.

### Which is updated more often, O or TAN.24?

O ships an update monthly, and TAN.24 every 34 months. Most recently, O was updated on September 10, 2026 and TAN.24 on September 11, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*